An aerial photography shows the wreckage of Asiana airlines Flight 214 after it crash-landed at SF International airport.

SAN FRANCISCO — An Asiana Airlines jetliner crash-landed at San Francisco International Airport on Saturday, killing two and injuring more than 180, as screaming passengers slid down rescue chutes before flames filled the cabin.

Dozens of survivors were taken to hospitals. Passengers said that despite the chaos, most aboard Flight 214, which originated in Shanghai with a stop in Seoul, seemed able to exit quickly and walk from the wreckage without help.

The cause was unclear, but federal investigators were looking into whether the plane clipped a sea wall separating the runway from San Francisco Bay, according to a source involved in the investigation. Officials said there was no indication that terrorism was involved.

“We were too low, too soon,” said passenger Benjamin Levy, who described looking out his window, seeing piers in the bay and thinking they were closer to the plane than they should have been.